Key benefits Large central opening for fast, comfortable handling with bare hands or while wearing thick cold-water gloves. Reduces fumbling and speeds tasks underwater. Versatile accessory for cave diving, technical diving, and many other diving applications — fits into standard workflows for line management and rigging. Includes a double-sided bolt that is strong and corrosion-resistant, designed to secure connections without cutting or pinching fingers. Lightweight and compact design makes it easy to carry on a harness, reel, or in a kit without adding bulk. What it does for you Improves control when passing lines, threading reels, or manipulating small hardware in low-visibility or cold-water conditions. Minimizes hand strain and risk of injury with a smooth, finger-friendly bolt and a spacious center hole that accepts gloved hands. Stands up to repeated exposure to salt water thanks to corrosion-resistant hardware, maintaining reliable performance over time. Compatibility and performance Function: central pass-through/handling aid with secure double-sided bolt for attachment or temporary fastening. Size: large central opening for use with bare hands and cold-water gloves; compact overall footprint for easy stowage. Material/performance: fitted with a corrosion-resistant double-sided bolt that provides strength and gentle contact with fingers. Practical use scenarios Cave diving: Hold and guide guideline or tie off a reel while wearing thick gloves, reducing fumbling during tight passages. Technical dives: Use as a compact handling aid when transferring lines or securing temporary attachments on stage bottles or harnesses. General diving tasks: Quickly thread or feed lines during deployment or retrieval operations without removing gloves. Simple to pack and use Lightweight and compact for mounting on a reel, attaching to D-rings, or keeping in a small kit pocket. Ready to use out of the box with no tools required for everyday diving tasks.